JPS61195645U - - Google Patents
Info
- Publication number
- JPS61195645U JPS61195645U JP8047685U JP8047685U JPS61195645U JP S61195645 U JPS61195645 U JP S61195645U JP 8047685 U JP8047685 U JP 8047685U JP 8047685 U JP8047685 U JP 8047685U JP S61195645 U JPS61195645 U JP S61195645U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- uhf
- vhf
- local oscillation
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 239000003990 capacitor Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Superheterodyne Receivers (AREA)
Description
第１図は本考案に係るテレビジヨンチユーナの
一実施例を示すブロツク的電気回路図、第２図は
従来のテレビジヨンチユーナを示すブロツク的電
気回路図である。
１１，１２：ＵＨＦ用（ＶＨＦ用）高周波増幅
回路、１３：周波数混合回路、１４，１５：ＵＨ
Ｆ用（ＶＨＦ用）局部発振回路、Ｄ１，Ｄ２：第
１（第２）のスイツチングダイオード。
FIG. 1 is a block electrical circuit diagram showing an embodiment of a television tuner according to the present invention, and FIG. 2 is a block electrical circuit diagram showing a conventional television tuner. 11, 12: High frequency amplifier circuit for UHF (for VHF), 13: Frequency mixing circuit, 14, 15: UH
Local oscillation circuit for F (for VHF), D 1 , D 2 : first (second) switching diode.
Claims (1)
いて、 ＵＨＦ用高周波増幅回路とＶＨＦ用高周波増幅
回路に対して１つの周波数混合回路を共用するよ
うに設け、 かつ、上記周波数混合回路にはＵＨＦ用局部発
振回路とＶＨＦ用局部発振回路からの各局部発振
回路を夫々結合コンデンサを介して印加するよう
にし、 上記ＵＨＦ又はＶＨＦ用高周波増幅回路からの
各信号を夫々スイツチングダイオードを介して選
択的に上記周波数混合回路に導き上記所定の局部
発振信号と周波数混合してＵＨＦ又はＶＨＦ用の
ＩＦ信号を得るようにして成るテレビジヨンチユ
ーナ。[Claims for Utility Model Registration] In a combination of UHF and VHF tuners, one frequency mixing circuit is provided to be shared by the UHF high frequency amplification circuit and the VHF high frequency amplification circuit, and the above frequency mixing circuit The local oscillation circuits from the UHF local oscillation circuit and the VHF local oscillation circuit are applied through coupling capacitors, and each signal from the UHF or VHF high frequency amplifier circuit is applied through a switching diode. selectively guided to the frequency mixing circuit and frequency-mixed with the predetermined local oscillation signal to obtain an IF signal for UHF or VHF.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8047685U JPS61195645U (en) | 1985-05-28 | 1985-05-28 | |
| US07/534,363 US4982444A (en) | 1985-05-28 | 1990-06-07 | Television tuning apparatus capable as serving selectively as a UHF tuner and a VHF tuner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8047685U JPS61195645U (en) | 1985-05-28 | 1985-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61195645U true JPS61195645U (en) | 1986-12-05 |
Family
ID=30626359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8047685U Pending JPS61195645U (en) | 1985-05-28 | 1985-05-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61195645U (en) |
-
1985
- 1985-05-28 JP JP8047685U patent/JPS61195645U/ja active Pending
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